In memory of Ben “bushing” Byer, who passed away on Monday, February 8th, 2016.

Difference between revisions of "Hardware/SMC"

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(Created page with "== General == The Wii U added a new chip to assist with power management alongside the RTC, labeled "SMC". The SMC is responsible for managing disc drive powe...")
 
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== Registers ==
 
== Registers ==
−
SMC has two types of registers: Read/write and command-based. Read/write registers operate by having the register number written (1 byte), followed by either another written byte, or a 1 byte read. Command-based registers perform their action just by writing the register number (1 byte). When attempting to read a command-based register, it will read as 0xFF. Registers wrap around after 0x7F.
+
SMC has two types of registers: Read/write and command-based. Read/write registers operate by having the register number written (1 byte), followed by either another written byte, or a 1 byte read. Command-based registers perform their action just by writing the register number (1 byte). When attempting to read a command-based register, it will read as 0xFF. Some registers will change themselves to read 0x97 if you attempt to write to them.
  
 
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| 0x02 || Command || ODD Eject Request
 
| 0x02 || Command || ODD Eject Request
 
|-
 
|-
−
| 0x0D || Read/Write? || 00 on power on?
+
| 0x8D || Read/Write? || 00 on power on?
 
|-
 
|-
−
| 0x0E || Read/Write? || 00 on power on?
+
| 0x8E || Read/Write? || 00 on power on?
 
|-
 
|-
−
| 0x0F || Read/Write? || 00 on power on?
+
| 0x8F || Read/Write? || 00 on power on?
 
|-
 
|-
 
| 0x10 || Command || ON LED on
 
| 0x10 || Command || ON LED on
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| 0x22 || Command || drc_wifi_rst
 
| 0x22 || Command || drc_wifi_rst
 
|-
 
|-
−
| 0x30 || Read/Write || TimerCounter
+
| 0x30 || Read/Write || TimerCounter, changes to 0x97 on write.
 
|-
 
|-
−
| 0x31 || ? || ?
+
| 0x31 || ? || ? Changes to 0x97 on write.
 
|-
 
|-
−
| 0x32 || ? || ?
+
| 0x32 || ? || ? Changes to 0x97 on write.
 
|-
 
|-
 
| 0x40 || Read/Write || ProgramRevision (val: 0xC5)
 
| 0x40 || Read/Write || ProgramRevision (val: 0xC5)
 
|-
 
|-
−
| 0x41 || Read/Write || SystemEventFlag
+
| 0x41 || Read/Write || SystemEventFlag, read-only
 
|-
 
|-
−
| 0x42 || Read/Write || ? (val: 0x0B)
+
| 0x42 || Read/Write || ?, read-only (val: 0x0B, 0x0A?)
 
|-
 
|-
 
| 0x43 || Read/Write || USB Power (bitmask; front USB: 0x1, rear USB: 0x2)
 
| 0x43 || Read/Write || USB Power (bitmask; front USB: 0x1, rear USB: 0x2)
 
|-
 
|-
−
| 0x44 || Read/Write || NotificationLED (val: 0x20)
+
| 0x44 || Read/Write || NotificationLED, current LED state. (bitmask: 0x97?)
 
|-
 
|-
 
| 0x45 || Read/Write || PowerFailureState (val: 0x08)
 
| 0x45 || Read/Write || PowerFailureState (val: 0x08)
 
|-
 
|-
−
| 0x46 || Read/Write || WifiRstCtrl (val: 0x00)
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| 0x46 || Read/Write || WifiRstCtrl (val: 0x00), changes to 0x97 on write.
 
|-
 
|-
−
| 0x47 || Read/Write || ? (val: 0xFF)
+
| 0x47 || Read/Write || ? not writable (val: 0xFF)
 
|-
 
|-
−
| 0x48 || Read/Write || ? (val: 0x0F)
+
| 0x48 || Read/Write || ? not writable (val: 0x0F)
 
|-
 
|-
−
| 0x60 || Read/Write || LAPSSetting (val: 0x00)
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| 0x60 || Read/Write || LAPSSetting (val: 0x00), changes to 0x97 on write.
 
|-
 
|-
−
| 0x61~0x70 || Read/Write || SystemError (val: 0x00)
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| 0x61~0x70 || Read/Write || SystemError, read-only (val: 0x00)
 
|-
 
|-
 
| 0x62~0x70 || Read/Write || ? (val: 0x00)
 
| 0x62~0x70 || Read/Write || ? (val: 0x00)
 
|-
 
|-
−
| 0x71 || Command? || Blinks the drive LED?
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| 0x71 || Command? || Blinks the drive LED? Causes 0x1C bytes to read as 0xFF.
 +
|-
 +
| 0x72 || Read/Write? || ? (val: 0x00)
 +
|-
 +
| 0x73 || Read/Write? || ? (val: 0x00)
 +
|-
 +
| 0x74 || Read/Write? || ? (val: 0x00)
 +
|-
 +
| 0x75 || Read/Write? || ? (val: 0x00)
 +
|-
 +
| 0x76 || Read/Write? || ? (val: 0x00)
 +
|-
 +
| 0x80~0xFF || Read/Write? || ? (val: 0x00)
 
|-
 
|-
 
|}
 
|}
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|-
 
|-
 
| 0x01 || SMC_WAKE1
 
| 0x01 || SMC_WAKE1
 +
|-
 +
|}
 +
 +
=== NotificationLED ===
 +
Kinda bitmaskey but also not really?
 +
 +
{| style="border: 1px solid #bbb; border-collapse: collapse; background-color: #eef; padding: 0.2em 0.2em 0.2em 0.2em;" border="1" cellpadding="2"
 +
|- style="background-color: #ddd;"
 +
! Value
 +
! Name
 +
|-
 +
| 0x97 || Some error condition? Happens if you write 0xFF or 0x00.
 +
|-
 +
| 0x80 || bitmask? sticky
 +
|-
 +
| 0x30 || Blue LED pulse
 +
|-
 +
| 0x20 || Blue LED on
 +
|-
 +
| 0x08 || Red LED on
 +
|-
 +
| 0x03 || Yellow LED pulse
 +
|-
 +
| 0x02 || Yellow LED on
 
|-
 
|-
 
|}
 
|}

Revision as of 07:42, 22 April 2023

General

The Wii U added a new chip to assist with power management alongside the RTC, labeled "SMC". The SMC is responsible for managing disc drive power/eject, power LED patterns, wireless resets, regulator enable/PGOOD monitoring, and possibly other unknown functionality.

Communication

SMC resides as device ID 0x50 on I2C bus 3. It communicates at 5kHz in IOS and 10KHz in Cafe2Wii?

Registers

SMC has two types of registers: Read/write and command-based. Read/write registers operate by having the register number written (1 byte), followed by either another written byte, or a 1 byte read. Command-based registers perform their action just by writing the register number (1 byte). When attempting to read a command-based register, it will read as 0xFF. Some registers will change themselves to read 0x97 if you attempt to write to them.

Index Type Description
0x00 Command ODD On
0x01 Command ODD Off
0x02 Command ODD Eject Request
0x8D Read/Write? 00 on power on?
0x8E Read/Write? 00 on power on?
0x8F Read/Write? 00 on power on?
0x10 Command ON LED on
0x11 Command ON LED on?
0x12 Command ON LED off
0x13 Command ON LED pulse
0x14 Command CC LED off
0x15 Command CC LED on
0x16 Command CC LED pulse
0x17 ? ?
0x18 ? ?
0x19 ? ?
0x1A ? ?
0x1B ? ?
0x1C ? ?
0x1D ? ?
0x1E Command OFF LED on
0x1F Command OFF LED pulse
0x20 Command bt_rst
0x21 Command wifi_rst
0x22 Command drc_wifi_rst
0x30 Read/Write TimerCounter, changes to 0x97 on write.
0x31 ? ? Changes to 0x97 on write.
0x32 ? ? Changes to 0x97 on write.
0x40 Read/Write ProgramRevision (val: 0xC5)
0x41 Read/Write SystemEventFlag, read-only
0x42 Read/Write ?, read-only (val: 0x0B, 0x0A?)
0x43 Read/Write USB Power (bitmask; front USB: 0x1, rear USB: 0x2)
0x44 Read/Write NotificationLED, current LED state. (bitmask: 0x97?)
0x45 Read/Write PowerFailureState (val: 0x08)
0x46 Read/Write WifiRstCtrl (val: 0x00), changes to 0x97 on write.
0x47 Read/Write ? not writable (val: 0xFF)
0x48 Read/Write ? not writable (val: 0x0F)
0x60 Read/Write LAPSSetting (val: 0x00), changes to 0x97 on write.
0x61~0x70 Read/Write SystemError, read-only (val: 0x00)
0x62~0x70 Read/Write ? (val: 0x00)
0x71 Command? Blinks the drive LED? Causes 0x1C bytes to read as 0xFF.
0x72 Read/Write? ? (val: 0x00)
0x73 Read/Write? ? (val: 0x00)
0x74 Read/Write? ? (val: 0x00)
0x75 Read/Write? ? (val: 0x00)
0x76 Read/Write? ? (val: 0x00)
0x80~0xFF Read/Write? ? (val: 0x00)

SystemEventFlag

Bitmask Name
0x40 SMC_POWER_BUTTON
0x20 SMC_EJECT_BUTTON
0x10 SMC_DISK_INSERT
0x08 SMC_TIMER
0x04 SMC_BT_IRQ
0x02 SMC_WAKE0
0x01 SMC_WAKE1

NotificationLED

Kinda bitmaskey but also not really?

Value Name
0x97 Some error condition? Happens if you write 0xFF or 0x00.
0x80 bitmask? sticky
0x30 Blue LED pulse
0x20 Blue LED on
0x08 Red LED on
0x03 Yellow LED pulse
0x02 Yellow LED on
Retrieved from "https://wiiubrew.org/w/index.php?title=Hardware/SMC&oldid=3610"